I have definitely noticed this with my husband (he is the narcoleptic). It makes sense though. On a cloudy day even those of us without N are tired and want to sleep. The thing with N is that it takes everything and magnifies the effects of it. You may want to try getting a sun lamp to plug in on cloudy days. It may help partially but, I don't know about the high barometric pressure. God bless

I feel better when it is sunny.I still have excessive day time sleepiness, but my spirts are lifted. I function better when the sun is shinning.

My disability was terminated because I told a doctor that I felt better in Florida than in Ohio. I had just came fromeseveral months od sun filled days back to Ohio where it ranny or cloudy for a couple of weeks. No wounder I felt better in Florida. The disability doctors say my excessive day time sleepiness is envormental not narcolepsy(my sleep test show differently). There must be more than 3 people narcolepsy that feel different when the weather changes, if so please, please reply.

These posts are from last year, so maybe my reply will still fit the question.

I live in TN and went to FL on vacation this spring. It was very bright and sunny and everything was growing, bright flowers, leaves were out on the trees. Came back home and it is still winter, snow, overcast, etc. I went into a really depressed state for 2 weeks.

I began to research this, after I realized I was depressed. There is something called the Circadian rhythm. If you have a chance google it.

According to wikipedia, circadian rhythms are affected primarily by daylight.

The following paragraph is a direct quote from wikipedia...

Circadian rhythms are important in determining the sleeping and feeding patterns of all animals, including human beings. There are clear patterns of core body temperature, brain wave activity, hormone production, cell regeneration and other biological activities linked to this daily cycle. In addition, photoperiodism, the physiological reaction of organisms to the length of day or night, is vital to both plants and animals, and the circadian system plays a role in the measurement and interpretation of daylength.
The rhythm is linked to the light-dark cycle. Animals, including humans, kept in total darkness for extended periods eventually function with a freerunning rhythm. Each "day," their sleep cycle is pushed back or forward, depending on whether their endogenous period is shorter or longer than 24 hours.

In layman's terms the circadian rhythm is responsible for determining when the body should release melatonin, which is a natural sleep inducer. It makes sense that changes in temp and light would trigger more melatonin to be released in narcoleptics.

Has anyone tried one of those bright lights that are recommended to combat depression?

This is a late reply, and I'm sure I'm not alone now. When the barometric pressure changes, it doesn't matter if I've taken my meds, I will feel groggy headed all day. Napping doesn't seem to help. I feel as though I have a migraine in the sense that I'm light and noise sensitive. Also my body temp drops and I can't get warm. I do know that sunny, warm days are best. Just feeling cold sets my narcolepsy off. VERY debilitating any extremely frustrating!!!

I definitely get the same thing